Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
tu cham » toc cham, thi cham
vu kham » vu khanh
hoc vat » hoc va, hoc viet, thuc vat
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca cua
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty xang xa hoi. hieu ((tu cham) or (vu kham)) hoc vat hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. hieu ((tu cham) OR (vu kham)) hoc vat hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang xa hoi. hieu ((tu cham) or (vu kham)) hoc vat hanh va cua te*.